Sedating antihistamines over the counter

28-Oct-2016 20:22

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Histamine also binds to other receptors located in nasal tissues, causing redness, swelling, itching, and changes in the secretions.

By blocking histamine receptors, antihistamines prevent symptoms.

Choosing the right medication often depends on matching your symptoms with what the colorful medicine box states the drug inside is capable of relieving. All About Antihistamines Antihistamines are the most common drugs taken to treat nasal allergy symptoms.

It can be very disappointing when runny nose, sneezing and nasal congestion remain unaffected by the “miracle drug.” In desperation, you may decide to double the dose or add another OTC allergy medication. There are two major classifications of antihistamines: Since the beginning of this decade, two second generation antihistamines have become available for OTC purchase: loratadine (brand of Claritin, Alavert, Wal-itin and others) and cetirizine (brand of Zyrtec, Walzyr and more coming).

For example, when you're fighting a cold (the rhinovirus), histamines widen the blood vessels in your nasal cavity, causing nasal congestion.When you inhale an allergen, mast cells located in the nose and sinus membranes release histamine.Histamine then attaches to receptors on nearby blood vessels, causing them to enlarge (dilate).And because of their powerful sedating qualities, antihistamines are also the active ingredients found in numerous over-the-counter sleep aids. The story begins with histamines, which are chemical compounds that play a couple of roles in the body, though they're best known for their involvement in the body's local immune responses.When you get injured or your immune system detects a potentially dangerous foreign substance, certain white blood cells and tissue cells release histamines that seek out and attach to other cells that have a histamine receptor.

For example, when you're fighting a cold (the rhinovirus), histamines widen the blood vessels in your nasal cavity, causing nasal congestion.When you inhale an allergen, mast cells located in the nose and sinus membranes release histamine.Histamine then attaches to receptors on nearby blood vessels, causing them to enlarge (dilate).And because of their powerful sedating qualities, antihistamines are also the active ingredients found in numerous over-the-counter sleep aids. The story begins with histamines, which are chemical compounds that play a couple of roles in the body, though they're best known for their involvement in the body's local immune responses.When you get injured or your immune system detects a potentially dangerous foreign substance, certain white blood cells and tissue cells release histamines that seek out and attach to other cells that have a histamine receptor..action_button.action_button:active.action_button:hover.action_button:focus,.action_button:hover.action_button:focus .count,.action_button:hover .count.action_button:focus .count:before,.action_button:hover .count:bullet.